Patents by Inventor Robert O. Duff

Robert O. Duff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240068280
    Abstract: A doorstop includes a first foot with a first sloped portion at a first end of the foot, a second sloped portion at a second end of the foot, a pedestal portion between the first end of the foot and the second end of the foot, and a bore in the pedestal portion and extending through the foot. The pedestal portion is flat and raised from the first sloped portion and the second sloped portion. The doorstop also includes an insert that fits inside the bore, a fastener that holds the insert inside the foot, and a handle adjacent to the insert and used to position the foot. The insert, the handle and the fastener can be removed from the first foot and used with a second foot, the second foot having the same configuration as the first foot.
    Type: Application
    Filed: August 26, 2022
    Publication date: February 29, 2024
    Inventor: Robert O. Duff
  • Publication number: 20240068279
    Abstract: A doorstop includes a foot, a cleat mounted on the foot, a rope with a first end connected to the cleat and a primary loop formed from a second end of the rope. The rope can be wound around the cleat.
    Type: Application
    Filed: August 26, 2022
    Publication date: February 29, 2024
    Inventor: Robert O. Duff
  • Publication number: 20240068292
    Abstract: A doorstop system includes a doorstop and a bracket. The doorstop includes a foot, a recess area within the foot, an opening in a bottom surface of the foot around the recess area, and pockets in opposite sides of the recess area extending to the bottom surface of the foot. The bracket is sized to fit into the recess area of the doorstop and includes a body and protrusions on opposite sides of the body. The protrusions are positioned and sized to mate with the doorstop pockets.
    Type: Application
    Filed: August 26, 2022
    Publication date: February 29, 2024
    Inventor: Robert O. Duff
  • Patent number: 9284765
    Abstract: A combination doorbumper and doorstopper includes a mounting plate, spindle, bumper, toggle bolt, and toggle bolt anchor. The doorbumper is installed on a wall so that a doorknob or door handle will engage the bumper when the door is fully opened. The spindle is positioned between the mounting plate and the bumper, and includes a narrow neck region. The door can be held in an opened position by placing a loop end of a flexible cord over the doorknob or handle on the opposite side of the door from the doorbumper, and stretching the cord so that a hook at the opposite end of the cord can be placed over the neck of the spindle. The doorbumper together with the flexible cord acts as a doorstopper to hold the door open.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: March 15, 2016
    Inventor: Robert O. Duff
  • Publication number: 20160047157
    Abstract: A combination doorbumper and doorstopper includes a mounting plate, spindle, bumper, toggle bolt, and toggle bolt anchor. The doorbumper is installed on a wall so that a doorknob or door handle will engage the bumper when the door is fully opened. The spindle is positioned between the mounting plate and the bumper, and includes a narrow neck region. The door can be held in an opened position by placing a loop end of a flexible cord over the doorknob or handle on the opposite side of the door from the doorbumper, and stretching the cord so that a hook at the opposite end of the cord can be placed over the neck of the spindle. The doorbumper together with the flexible cord acts as a doorstopper to hold the door open.
    Type: Application
    Filed: August 18, 2014
    Publication date: February 18, 2016
    Inventor: Robert O. Duff
  • Patent number: 8960739
    Abstract: A tool includes a double wedge, a tongue, and a wedge. The double wedge has a top surface, a bottom surface, a front, a rear, a right side, and a left side. The tongue extends from the front of the double wedge and the wedge extends from the rear of the double wedge. Either the tongue or the wedge can be inserted between a door and another surface to hold the door open.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: February 24, 2015
    Inventors: Robert O. Duff, Rosetta Duff
  • Publication number: 20110254293
    Abstract: A tool includes a double wedge, a tongue, and a wedge. The double wedge has a top surface, a bottom surface, a front, a rear, a right side, and a left side. The tongue extends from the front of the double wedge and the wedge extends from the rear of the double wedge. Either the tongue or the wedge can be inserted between a door and another surface to hold the door open.
    Type: Application
    Filed: April 20, 2011
    Publication date: October 20, 2011
    Inventors: Robert O. Duff, Rosetta Duff
  • Patent number: 7976080
    Abstract: A doorstop has a foot coupled to a lower end of a handle. The handle of the doorstop has a length that allows a user to insert the foot under a lower edge of a door and to remove the foot from under the lower edge without requiring the user to bend over. The handle is removable from the foot for easy storage and travel. The doorstop foot may include a button for attachment to a clip thereby enabling a user to carry the doorstop on a belt. The coupling between the foot and handle is releasably securable and may be mechanical or magnetic. The handle may also telescope between a contracted position and an extended position.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: July 12, 2011
    Inventor: Robert O. Duff
  • Patent number: 6557915
    Abstract: A doorstop having a telescoping handle and a foot mounted at a lower end of the handle. The handle of the doorstop has a length that allows a user to insert the foot under a lower edge of a door and to remove the foot from under the lower edge without requiring the user to bend over.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: May 6, 2003
    Assignee: Duff's Door Stopper
    Inventor: Robert O. Duff